Hi Owen,
This is due to the nature of Orders and Sales. Each sale record is linked to an Item record, and a Shipment contains 1 or more Sales. An Order can contain 1 or more Shipments. So the Orders grid will only show one line in the Grid view for Orders, and you’ll only see the first sale Custom field.
To see the per sale custom fields, try using the Sales Analysis window, remove the OrderID grouping, group by your custom field and save that as a custom grid layout. That should work for you.
John Manning, Senior Developer